1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
#![cfg(feature = "random")]
use crate::{Layout, Variant, Version, UUID};
use rand;
impl UUID {
pub fn v4() -> Layout {
let rng = rand::random::<u128>();
let rand = rng.to_be_bytes();
Layout {
field_low: ((rand[0] as u32) << 24)
| (rand[1] as u32) << 16
| (rand[2] as u32) << 8
| rand[3] as u32,
field_mid: (rand[4] as u16) << 8 | (rand[5] as u16),
field_high_and_version: ((rand[6] as u16) << 8 | (rand[7] as u16)) & 0xfff
| (Version::RAND as u16) << 12,
clock_seq_high_and_reserved: (rand[8] & 0xf) | (Variant::RFC as u8) << 4,
clock_seq_low: rand[9] as u8,
node: [rand[10], rand[11], rand[12], rand[13], rand[14], rand[15]],
}
}
}
#[macro_export]
macro_rules! v4 {
() => {
format!("{}", $crate::UUID::v4().as_bytes())
};
(expr:lower) => {
format!("{}", $crate::UUID::v4().as_bytes().to_lower())
};
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_v4() {
let uuid = UUID::v4();
assert_eq!(uuid.get_version(), Some(Version::RAND));
assert_eq!(uuid.get_variant(), Some(Variant::RFC));
}
}